Role of the size distribution in the elasticity of entangled living polymer solutions
Groupe de Dynamique des Phases Condensées (UMR 5581 CNRS-UM2),
Université Montpellier 2 - 34095 Montpellier Cedex 5,
Accepted: 15 October 2001
The linear rheology of wormlike micelles decorated with amphiphilic copolymer is reported. They are model polymer solutions to address the role of polydispersity in the scaling of the elastic plateau modulus G0 with concentration ϕ. Allowing only micelles of coil size larger than the mesh size of the network to contribute to its elasticity, we account for the unusually fast increase of G0 at low ϕ. Our model enables a determination of the micellar scission energy, whose decrease with copolymer rate is independently confirmed by dynamic light scattering.
PACS: 83.80.Qr – Surfactant and micellar systems, associated polymers / 83.60.Bc – Linear viscoelasticity / 83.80.Rs – Polymer solutions
© EDP Sciences, 2002